How to Install the NXB-SRV-DC112-005 DC Servo Motor

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Tools Required

• Torque wrench (5-15 Nm range)
• 5mm metric hex key set
• ESD wrist strap
• Lint-free cloths
• Isopropyl alcohol
• Flathead screwdriver

Article

This article provides detailed instructions for the proper installation of the NexBot Robotics DC112-005 DC Servo Motor. This procedure is applicable when replacing a faulty motor or installing a new motor on the J3, J4, or J5 axes of compatible NexBot industrial robots. Following these steps carefully is crucial for ensuring system integrity, maintaining the IP65 rating, and guaranteeing optimal performance.

Prerequisites

Before beginning the installation, ensure you have met the following requirements. Failure to do so can result in equipment damage or personal injury.

Safety Precautions:

• The robot system must be completely powered down.
• Follow all standard Lockout/Tagout (LOTO) procedures for the robot cell to de-energize all power sources (electrical, pneumatic, hydraulic).
• The robot arm must be mechanically secured or resting in a safe, stable home position to prevent unexpected movement.
• Use appropriate personal protective equipment (PPE), including an ESD wrist strap to prevent damage to sensitive electronics.

Parts and Tools:

• One (1) NXB-SRV-DC112-005 DC Servo Motor. Inspect the new motor for any signs of shipping damage before installation.
• Replacement O-rings or seals for motor flange and connectors, if not pre-installed on the new motor.
• Mounting Hardware: Four (4) M6x20mm socket head cap screws (or as specified by your robot's service manual).

Required Tools:

• Torque wrench with a 5-15 Nm range
• 5mm metric hex key or socket
• ESD wrist strap
• Lint-free cloths
• Isopropyl alcohol (99%)
• Small flathead screwdriver (for connector locking mechanisms)

Step-by-Step Instructions

1. Prepare the Robot

1. Power down the robot controller and disconnect main power as per your facility's LOTO procedures.
2. If replacing an existing motor, move the robot arm to a position that provides clear access to the target joint (J3, J4, or J5).
3. Secure the robot arm using mechanical brakes or external supports to prevent it from falling when the motor is removed.

2. Access and Remove the Old Motor (If Applicable)

1. Carefully remove the plastic or metal joint covers to expose the motor. Keep track of all screws and fasteners.
2. Identify the power and communication (PROFINET) cables connected to the motor. Use a flathead screwdriver to gently release the locking tabs on the industrial connectors.
3. Disconnect the cables and move them aside. Inspect connectors for any signs of damage or corrosion.
4. Using a 5mm hex key, loosen the four M6 mounting bolts in a star pattern (e.g., top-right, bottom-left, top-left, bottom-right). This prevents warping the mounting flange.
5. Once all bolts are loose, remove them completely and carefully slide the old motor out of the joint housing. The motor may be a tight fit; do not use excessive force.

3. Prepare for New Motor Installation

1. Thoroughly clean the motor mounting flange on the robot arm using a lint-free cloth and isopropyl alcohol. Remove all old grease, dirt, and sealant residue.
2. Inspect the mounting surface for any scratches or gouges that could compromise the IP65 seal.
3. Unbox the new NXB-SRV-DC112-005 motor. Verify the shaft key is present and correctly oriented to align with the gearbox or drive mechanism inside the joint.
4. Confirm the O-ring seal is properly seated in the groove on the motor's mounting face.

4. Mount the New Motor

1. Carefully align the motor shaft and key with the joint's drive coupling and slide the new motor into place. Ensure it sits flush against the mounting flange without being forced.
2. Insert the four M6 mounting bolts and hand-tighten them to secure the motor.
3. Using a torque wrench, tighten the bolts in a star pattern to a final torque of 10 Nm. This is critical for even pressure distribution and maintaining the environmental seal.

5. Connect and Secure Cables

1. Reconnect the power and PROFINET cables to the corresponding connectors on the NXB-SRV-DC112-005 motor.
2. Ensure each connector is fully seated and that the locking mechanism clicks into place to secure the connection and maintain the IP65 rating.
3. Route the cables neatly and secure them using any original cable management clips or ties. Ensure the cables have enough slack to allow for the full range of motion of the joint without being strained.
4. Re-install the joint covers removed in step 2.

Verification and Commissioning

After the physical installation is complete, you must verify its function within the robot control system.

1. Remove LOTO: Following safety protocols, remove all locks and tags and restore power to the robot controller.
2. Check for Errors: Power on the controller. Observe the teach pendant for any startup errors. Address any communication or drive fault errors related to the newly installed axis.
3. Mastering/Calibration: A new motor installation requires the axis position to be recalibrated. Follow the procedure in your robot's software manual for 'Axis Mastering' or 'Encoder Commutation'. This step is mandatory for accurate positioning.
4. Test Motion: In manual mode and at a very low speed (e.g., 5-10%), jog the affected axis back and forth. Listen for any unusual noises (grinding, whining) and watch for any jerky movements. The motion should be smooth and quiet.
5. Full System Test: If the manual jog test passes, run a pre-written test program that moves the robot through its full range of motion to confirm that the new motor performs as expected under normal operating conditions.

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